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The singer was deemed too ill to perform on Saturday night, but just three days earlier was seen yelling and screaming on Bonfire Night.

Producers made the unprecedented decision to give her a 'bye', allowing the 17-year-old to sit out the Mariah Carey themed night.

Scream queen: Diana Vickers on Bonfire Night three days before she missed her performance on X Factor

Laura White, who is also mentored by Cheryl Cole, was then voted off in a shock elimination.

Diana is said to have complained about her voice on the previous Sunday, and missed rehearsals all week.

But she made the strange decision to brave the cold weather on Wednesday, where she was filmed squealing and energetically jumping up and down with her fellow contestants.

It has triggered a host of conspiracy theories on internet message boards and forums, with some suggesting it was a move to keep her in the competition for as long as possible.

What sore throat? Diana decided to attend the fireworks despite complaining about her voice since the previous Sunday

Viewer Isabel wrote on one site: 'Conveniently, it meant that she didn't have to sing a Mariah song, which she could struggle with.'

Others claimed the teen was receiving special 'star' treatment.

Fan Michelle Astley from Norfolk added: 'I'm really angry because I feel as though I've been conned. Everyone is understanding if Diana really is ill, but then we see her screaming her head off.

Too sick: The 17-year-old was shown tucked up in bed during with laryngitis a day later

Diana said today: 'I felt under the weather all last week but didn’t want to miss out on the fireworks display.

'On Thursday I saw the doctor and was given antibiotics and the following day was diagnosed with Laryngitis by a Harley Street specialist.

'Up until Saturday afternoon, I was still hoping and praying that I would be well enough to perform but the producers spoke to the doctor who made it clear that I could risk long-term damage to my voice.

'I was absolutely devastated to be told I couldn’t perform on Saturday night and disappointed not to be able to meet Mariah Carey.

'I am due to see the doctor again on Friday so fingers crossed I will be able to take part in this Saturday’s show.'

An X Factor spokesman added: 'All the contestants were fully behind the decision to give her a bye.'